Buggy code:
public final class Workbench implements IWorkbench { private static final String [ ] VERSION_STRING = new String [ ] { "0.046" , "2.0" } ; private static final String DEFAULT_WORKBENCH_STATE_FILENAME = "workbench.xml" ; private static Workbench instance ; private static WorkbenchTestable testableObject ; private Display display ; private WindowManager windowManager ; private WorkbenchWindow activatedWindow ; private EditorHistory editorHistory ; private boolean runEventLoop = true ; private boolean isStarting = true ; private boolean isClosing = false ; private int returnCode ; private ListenerList windowListeners = new ListenerList ( ) ; private WorkbenchAdvisor advisor ; private WorkbenchConfigurer workbenchConfigurer ; private ExtensionEventHandler extensionEventHandler ; private Workbench ( Display display , WorkbenchAdvisor advisor ) { } public static final Workbench getInstance ( ) { } public static final int createAndRunWorkbench ( Display display , WorkbenchAdvisor advisor ) { } public static Display createDisplay ( ) { } public static WorkbenchTestable getWorkbenchTestable ( ) { } public void addWindowListener ( IWindowListener l ) { } public void removeWindowListener ( IWindowListener l ) { } protected void fireWindowOpened ( final IWorkbenchWindow window ) { } protected void fireWindowClosed ( final IWorkbenchWindow window ) { } protected void fireWindowActivated ( final IWorkbenchWindow window ) { } protected void fireWindowDeactivated ( final IWorkbenchWindow window ) { } private boolean busyClose ( final boolean force ) { } public boolean saveAllEditors ( boolean confirm ) { } private IWorkbenchWindow busyOpenWorkbenchWindow ( String perspID , IAdaptable input ) throws WorkbenchException { } public boolean close ( ) { } boolean close ( int returnCode , final boolean force ) { } public IWorkbenchWindow getActiveWorkbenchWindow ( ) { } protected EditorHistory getEditorHistory ( ) { } public IEditorRegistry getEditorRegistry ( ) { } private int getNewWindowNumber ( ) { } public IPerspectiveRegistry getPerspectiveRegistry ( ) { } public PreferenceManager getPreferenceManager ( ) { } public IPreferenceStore getPreferenceStore ( ) { } public ISharedImages getSharedImages ( ) { } WindowManager getWindowManager ( ) { } private File getWorkbenchStateFile ( ) { } public int getWorkbenchWindowCount ( ) { } public IWorkbenchWindow [ ] getWorkbenchWindows ( ) { } public IWorkingSetManager getWorkingSetManager ( ) { } private boolean init ( Display display ) { } private void initializeCommandResolver ( ) { } private void initializeApplicationColors ( ) { } private void initializeSingleClickOption ( ) { } private void initializeFonts ( ) { } private void initializeImages ( ) { } private void uninitializeImages ( ) { } private void initializeColors ( ) { } public boolean isClosing ( ) { } boolean isStarting ( ) { } private WorkbenchWindow newWorkbenchWindow ( ) { } private void forceOpenPerspective ( ) { } void openFirstTimeWindow ( ) { } IStatus restoreState ( ) { } public IWorkbenchWindow openWorkbenchWindow ( IAdaptable input ) throws WorkbenchException { } public IWorkbenchWindow openWorkbenchWindow ( final String perspID , final IAdaptable input ) throws WorkbenchException { } private XMLMemento recordWorkbenchState ( ) { } public boolean restart ( ) { } private IStatus restoreState ( IMemento memento ) { } public String [ ] getEarlyActivatedPlugins ( ) { } private void startPlugins ( ) { } private int runUI ( ) { UIStats . start ( START_WORKBENCH , "Workbench" ) ; Listener closeListener = new Listener ( ) { public void handleEvent ( Event event ) { event . doit = close ( ) ; } } ; <START_BUG> Window . IExceptionHandler handler = new ExceptionHandler ( ) ; <END_BUG> try { display . addListener ( Close , closeListener ) ; Window . setExceptionHandler ( handler ) ; boolean initOK = init ( display ) ; Platform . endSplash ( ) ; if ( initOK ) { advisor . postStartup ( ) ; } if ( initOK && ( runEventLoop ) ) { startPlugins ( ) ; display . asyncExec ( new Runnable ( ) { public void run ( ) { UIStats . end ( START_WORKBENCH , "Workbench" ) ; } } ) ; Workbench . getWorkbenchTestable ( ) . init ( display , this ) ; runEventLoop ( handler , display ) ; } } catch ( final Exception e ) { if ( ! ( display . isDisposed ( ) ) ) { handler . handleException ( e ) ; } else { String msg = "Exception<seq2seq4repair_space>in<seq2seq4repair_space>Workbench.runUI<seq2seq4repair_space>after<seq2seq4repair_space>display<seq2seq4repair_space>was<seq2seq4repair_space>disposed" ; WorkbenchPlugin . log ( msg , new Status ( IStatus . ERROR , WorkbenchPlugin . PI_WORKBENCH , 1 , msg , e ) ) ; } } finally { if ( ! ( display . isDisposed ( ) ) ) { display . removeListener ( Close , closeListener ) ; } } return returnCode ; } private void runEventLoop ( Window . IExceptionHandler handler , Display display ) { } private IStatus saveState ( IMemento memento ) { } private boolean saveMementoToFile ( XMLMemento memento ) { } public IWorkbenchPage showPerspective ( String perspectiveId , IWorkbenchWindow window ) throws WorkbenchException { } public IWorkbenchPage showPerspective ( String perspectiveId , IWorkbenchWindow window , IAdaptable input ) throws WorkbenchException { } private void shutdown ( ) { } public IDecoratorManager getDecoratorManager ( ) { } private WorkbenchWindow getActivatedWindow ( ) { } void setActivatedWindow ( WorkbenchWindow window ) { } WorkbenchConfigurer getWorkbenchConfigurer ( ) { } WorkbenchAdvisor getAdvisor ( ) { } public Display getDisplay ( ) { } public String getDefaultPerspectiveId ( ) { } public IAdaptable getDefaultPageInput ( ) { } public String getMainPreferencePageId ( ) { } public IElementFactory getElementFactory ( String factoryId ) { } public IProgressService getProgressService ( ) { } private WorkbenchActivitySupport workbenchActivitySupport ; private WorkbenchCommandSupport workbenchCommandSupport ; private WorkbenchContextSupport workbenchContextSupport ; public IWorkbenchActivitySupport getActivitySupport ( ) { } public IWorkbenchCommandSupport getCommandSupport ( ) { } public IWorkbenchContextSupport getContextSupport ( ) { } private final ICommandManagerListener commandManagerListener = new ICommandManagerListener ( ) { public final void commandManagerChanged ( final CommandManagerEvent commandManagerEvent ) { } } ; private final IContextManagerListener contextManagerListener = new IContextManagerListener ( ) { public final void contextManagerChanged ( final ContextManagerEvent contextManagerEvent ) { } } ;

Fix:
Window . IExceptionHandler handler = ExceptionHandler . getInstance ( ) ;